Lauri Paatero, 3d
The Home page has a little more information.
I am author of GOWrite. GOWrite full featured SGF editor for GO. Its main strenght is in good publication features. GOWrite is used by several book and magazine authors.
Current GOWrite version
is Java based and uses SGF format 4. It works at least in Windows, Linux and MAC.
Latest beta (2.1.05) supports copying diagrams in Senseis Library format to clipboard. Sensei's library format can be selected from Options->Clipboard graphics.